Method of forming a helical gear with clutch teeth



Dec. 1, 1936. c. D. PETERSON 2,062, 7

METHOD OF FORMING A HELICAL GEAR WITH CLIjTCH TEETH Filed Dec. 19, 1932ATTORNEYS.

Patented Dec. 1, 1936 METHOD OF FORMING A HELICAL GEAR WITH CLUTCH TEETHCarl D. Peterson, Toledo, Ohio, assignor to Spicer ManufacturingCorporation, Toledo, Ohio, a corporation of Virginia ApplicationDecember 19, 1932, Serial No. 647,917

1 filaim.

This invention has for its principal object, a method of forming ahelical gear with teeth at one end parallel to the axis of the gear andformed from end portions of the helical teeth.

The invention consists in the method and steps The subject matter ofthis invention is in the forming of such teeth, or clutch gear teeth onthe driving section, or gear I, when the gear is a helical gear. 1

The method consists in forming the gear with hereinafter set forth andclaimed. helical teeth extending from end to end and 5 In describingthis invention, reference is had cutting end portions of the helicalteeth so that to the accompanying drawing in which like charthe flanksof the end portions are parallel to the acters designate correspondingparts in all the axis of the gear and located Within continuaviews.tions of the flanks of the helical teeth, and also Figure l is asectional View of a helical gear preferably cutting the top faces of theend porprovided with parallel clutch teeth at one end, tions lyingwithin the circle of the top faces of the coacting clutch section withteeth for coactthe helical teeth with the corners formed at ing with theparallel teeth, and also the shafts angles of the flanks and top facesof the end on which the helical gear and clutch section are portionsparallel to the axis of the gear. To famounted, being shown. cilitatethe forming of the end portions in clutch Figure 2 is an end view of thehelical gear lookgear teeth, an annular groove is cut separating ing tothe left, Figure 1. the helical teeth from the end portions, or clutchFigure 3 is a fragmentary, isometric view of gear teeth. the helical andparallel teeth. 3 designates the helical teeth of the gear I.

I have here illustrated my invention as em- 4 designates the teeth,which are parallel to bodied in a direct drive, or high speed clutch, ofthe axis of the gear I, that is, the clutch gear,

a transmission gearing used in motor vehicles. teeth, these beinghereinafter referred to for con- As will be understood by those skilledin the venience, as parallel teeth, as they are parallel art, thetransmission mechanism includes a drive to the axis of the gear I. Theparallel teeth 4 shaft, a driven shaft, and a countershaft, all areformed from end portions of the spiral teeth suitably mounted in thegear box, the transmis- 3, and located entirely between linealcontinuasion shaft being arranged in axial alinement to tions of sidefaces or flanks ofthe helical teeth the drive shaft, and beingconnectible thereto of the gear proper, so that, as seen in Figure 3,through a direct drive, or high speed clutch. the topfaces 6 of theparallel teeth have their Other drives, or changes, in speed areeffected inner and outer end portions formed partly in through gears onthe countershaft and transthe flank portions of the helical teeth, orlineal mission shaft, some of which are shiftable. continuationsthereof. 'An annular groove, or

The drive shaft is connected to the counterrelief I is provided betweenopposing ends of shaft through intermeshing gears, and the counthehelical teeth of the gear, and the parallel tershaft to the transmissionshaft through gears, or clutch teeth, of the gear. some of which areshiftable. The drive shaft is In formingthe helical gear with theparallel usually the stem of a stem gear I which meshes clutch teeth,the gear blank is formed with the with a gear on the countershaft todrive the helical teeth extending from end to end therecountershaft. Adesignates the drive shaft, B of, thereafter the relief, or annulargroove 1, 40 the transmission shaft in line therewith, it havcut, andthen the end portions of the helical ing a pilot bearing C in the driveshaft, or the teeth out down so that the flanks of said end gearthereon. The stem gear I is usually formed portions are parallel to theaxis of the gear. with one section of the direct drive, or high Thus,the edge 8 of the corner formed by one speed clutch, and is usuallyformed integral with flank of the parallel tooth and the inner end facethe drive shaft A. of the parallel tooth, is located in the flank line 2designates the other section of the direct 9 of the helical tooth, orthe continuation theredrive clutch and is slidably mounted on the of,and its'diagonally opposite edge II] of the transmission shaft B, andshiftable in any well corner formed by the other flank and the outerknown manner. The sections of the high speed or front end of theparallel tooth, is located in clutch have inter-engaging teeth, thesebeing usually external teeth on the driving section, or gear I, andinternal teeth on the section 2. These teeth are in the nature of gearteeth, and

' are referred to in shop parlance as clutch gears.

the flank line II of the helical tooth, or continuation thereof. Thisarrangement gives a maximum thickness to the parallel tooth for a givenlength of parallel teeth and/or a given angle of the helical teeth.

The other section 2 of the clutch is provided with external teeth M formeshing with a. gear on the countershaft, not shown, in the usualmanner, and also with internal teeth I5 for coacting with the parallelteeth 4. The internal teeth l5 are formed in any well known manner, andthe formation thereof constitutes no part of this invention.

This helical gear with clutch teeth is particu- 10 larly simple andeconomical in manufacture.

What I claim i'si I The method of providing helical gears with teeth atone end parallel to the axis of the gear consisting in forming the gearblank with helical teeth and then straightening corresponding endportions of the helical teeth by cutting off the opposite helical sidefaces of said end por; tions into lines parallel with the axis of thegear.

CARL D. PETERSON.

